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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91926e4750a1f2760a1b3996e94c231d461121323406548e62bb0ce60d54352' 
  AND token = 'qrscm8WPiLBAL0RYCwopUx1gw1TBbizae0bdXpHOEYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}